Bobbin ejector for bobbin winding machines



Jan. 4, 1955 F. L. TOWNSEND 2,698,720

BOBBIN EJEICTOR FOR BOBBIN WINDING MACHINES Filed Feb. 28, 1952 Fig. 1. K

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" x Frag/UM L. Tow/7s end BY A (m W (1% ATTORNEYS United States Patent BOBBIN EJECTOR FOR BOBBIN WINDING MACHINES Franklin L. Townsend, Loves Park, Ill., assignor to Barger-Colman Company, Rockford, 11]., a corporation of linois Application February 28, 1952, Serial No. 273,827

14 Claims. (Cl. 242-41) The invention relates to bobbin winding machines and more especially to a means operatively related to the bobbin holding means for insuring the ejection of the bobbin upon the completion of the winding operation; and the general object of the invention is to provide ejector means operative in the retraction of a bobbin holding chuck to positively disengage the wound bobbin therefrom.

A further object is to provide a bobbin ejecting mechanism in which the advancing movement of a reciprocable chuck support is utilized to condition a thrust device for the positive actuation of an ejector element upon the retraction of the support.

The objects of the invention thus generally stated, together with other and ancillary advantages, are attained by the construction and arrangement shown by way of example in the accompanying drawings, wherein:

Figure 1 is a fragmentary transverse sectional view through a bobbin winding machine of the general type shown in Marcellus Patent No. 2,409,639, dated October and Drake Patent No. 2,445,998, dated July Figure 2 is a fragmentary longitudinal sectional view on an enlarged scale showing the ejector mechanism embodied in the centering slide which constitutes a support for the chuck which supports the tip end of the bobbin.

Figure 3 is a transverse sectional view taken on the plane of line 3-3 of Figure 2.

Figure 4 is a fragmentary longitudinal sectional view similar to Figure 2 but showing another embodiment of the invention.

The invention is shown for purposes of illustration as incorporated in a bobbin winding machine having a centering slide of the type disclosed in Drake Patent No. 2,445,998. The slide constitutes a support for a bobbin holder 11 supporting the tip end of a bobbin and coacting with a chuck 12 (Fig. 1) mounted on a winding spindle 13 and serving to support the butt end of the bobbin. Associated with the spindle 13 is a yarn traversing cam 14 reciprocated during the winding operation by means including rack and pinion gearing 15. The slide 10 is arranged for reciprocation by power driven means, including a gear segment 17 meshing with a rack 18 on the slide 10 and rocked so as to impart advancing and retracting movements to the slide in timed relation to the winding cycle. Preferably, the motion of the rack is transmitted to the slide through the medium of a coiled spring 19, the rack being formed separately from the slide and received within a groove 20 on the underside of the slide.

In the present instance the slide 10 is generally cylindrical in form and the head 16 is appropriately shaped to form a slideway, the slide being held against rotation by a key bar 21. This bar is secured to the head 16 within the slideway as by means of a screw 22 and is received within a longitudinally extending groove 23 in I "ice end of the bore 25 and serving to clamp the antifriction bearing in position therein.

In accordance with the invention, the advancing and retracting movements of the slide 10 are utilized to effect the positive ejection of wound bobbins gripped in the chuck 24, during the initial portion of the retracting movement of the slide. The ejecting means includes an ejector element, which may advantageously take the form of a headed pin 28 slidable axially through the chuck 24, and a thrust device 29 operatively associated with the pin and conditioned during the advancing movement of the slide so as to be effective in the retracting movement thereof in the performance of the ejecting operation.

In the embodiment of the invention shown in Figs. 2 and 3, the thrust device 29 is in the form of a pin slidable in a diagonal bore 30 in the slide, the forward end of the bore being disposed axially of the slide and its rear end opening at the periphery thereof into the groove 23. The pin is of a length somewhat greater than the bore 30 and its forward end is operatively associated with the ejector pin through the medium of a pin-like block 31 slidable in a counterbore 25a opening at its forward end into the bore 25. The rear end of the pin is rounded to provide a cam surface for coaction with an abutment formed in the present instance by a shoulder 32 on the stationary key bar 21.

In the retracted position of the slide shown in broken lines in Fig. 2, the upper rear end of the thrust pin 29 underlies the bar 21 and is held thereby against rearward shifting movement relative to the slide. Accordingly, the ejector pin 28 is advanced with the slide until the rear end of the thrust pin clears the shoulder 32 on the bar 21, the parts being so proportioned that this occurs substantially coincidentally with the abutment of the ejector pin with the tip end of the bobbin and somewhat in advance of the engagement of the bobbin by the chuck 24. Thus, in the final portion of the advancing movement of the slide during which the chuck is moved into gripping engagement with the bobbin, the thrust pin 29 is interrupted in its forward travel and, by reason of the inclination of the bore 30, the position of the pin relative to the slide is shifted so that the rear end of the pin enters the groove 23 immediately forward of the shoulder 32. Preferably, the arrangement is such that the upper rear end of the pin moves only partially into the groove so as to engage with the lower edge of the shoulder 32 substantially as shown in Fig. 2.

During the initial portion of the retracting movement of the slide, the thrust pin 29 and, therefore, the ejector pin 28, are restrained from movement with the slide with the result that the chuck 24, moving with the slide, becomes disengaged from the tip end of the bobbin. At the same time, the rounded rearward end of the pin engaging with the lower edge of the shoulder is forced by cam action forwardly in its bore until the pin clears the shoulder and is therefore free to travel rearwardly with the slide during the movement of the latter to its fully retracted position.

It will be observed that in the advance of the slide the shifting of the thrust pin relative thereto occurs as a result of the interruption of the movement of the ejector pin, and that in the return of the slide the pin is shifted reversely in its bore as the rounded end of the pin is being forced by cam action around the lower edge of the shoulder 32. To avoid binding of the thrust pin upon the under surface of the key bar 21 during the remainder of the retracting stroke, this surface may be tapered slightly in a forward direction.

As shown in Fig. 2, the key bar 21 is provided with a plurality of threaded holes spaced apart longitudinally. This permits fastening of the bar to the head 21 in a plurality of different positions to accommodate the structure to bobbins of different lengths.

Another construction for utilizing the advancing and retracting movements of the slide to effect positive rejection of the bobbin from the chuck is shown in Fig. 4. In this instance the thrust device comprises a toggle linkage 33 and a pin 34 disposed axially of the slide and bearing upon the rear end of the ejector pin 28. One of the toggle links is connected to the slide and the other to the pin 34. To receive the toggle, the slide is provided with a longitudinal groove 35. The hinged joint of the toggle bears upon the key bar 21 during the major portion of the advancing movement of the slide, and during this movement is held against shifting movement relative to the slide. When, however, the joint of the toggle passes the shoulder 32 of the key bar, substantially concurrently with the abutment of the ejector pin 28 with the bobbin, the toggle joint shifts laterally into the groove 23 so as to occupy a position immediately forward of the shoulder 32. Upon the return of the slide, the upper end portion of the rear toggle link engages with the shoulder 32 to impart a collapsing movement to the toggle bv cam action. During such movement the pin 34 and, therefore, the ejector pin 28 are restrained from movement with the slide while the chuck, moving with the slide, becomes disengaged from the bobbin. Any suitable means may be employed to limit the extent of collapsing movement of the toggle, such, for example, as a lug 36 on the forward link engageable with the upper side of the pin 34 rearwardly of its connection with the pin.

It will be observed that in both embodiments illustrated, the thrust element is permitted to shift laterally upon interruption of the movement of the ejector pin by engagement with the bobbin, and that in such lateral shifting movement the thrust element is conditioned for the performance of the ejecting operation by cam action between the thrust element and the key bar during the initial portion of the return movement of the slide. Finally, the thrust element is restored to its initial position in the continued retracting movement of the slide.

I claim as my invention:

1. In a bobbin winding machine having a bobbin holding means including a recessed chuck, a support for the chuck, power driven means for the support operative to carry the chuck into and out of gripping engagement with one end of a bobbin, a bobbin ejector element shiftable relative to the chuck, means including a thrust device operative during the advance of the chuck into gripping engagement with the bobbin to advance the ejector element into holding relation to the bobbin, and means operative upon said thrust device during the retraction of the support to maintain said holding relation of the ejector element relative to the bobbin while the chuck is being disengaged from the bobbin.

2. In a bobbin winding machine having a bobbin holding means including a recessed chuck, a support for the chuck, power driven means for the support operative to carry the chuck into and out of gripping engagement with one end of a bobbin, a bobbin ejector element shiftable relative to the chuck, a thrust device for the ejector element shiftable relative to the support, and means coacting with said thrust device to hold it against shifting movement so as to render it effective to advance the ejector element into holding relation to the bobbin, said means being operative to permit shifting of the thrust device in the final advance of the support to carry the chuck into engagement with the bobbin and as an incident to the interruption in the advance of the ejector element, and said means being further operative in the initial portion of the retracting movement of the support to restrain the thrust device and thereby the ejector element against movement with the support.

3. In a bobbin winding machine having a bobbin holding means including a recessed chuck, a support for the chuck, power driven means for the support operative to carry the chuck into and out of gripping engagement with one end of a bobbin, a bobbin ejector element shiftable relative to the chuck, and means operative during the advance of the chuck into gripping engagement with the bobbin to advance the ejector element into holding relation to the bobbin and during the retraction of the support to maintain said holding position of the ejector element While the chuck is being disengaged from the bobbin, said means including an abutment and a thrust device shiftable relative to the support for movement into engagement with said abutment as an incident to the movement of the chuck into engagement with the bobbin.

4. In a bobbin winding machine having a bobbin holding means including a recessed chuck, a support for the chuck, power driven means for the support operative to carry the chuck into and out of gripping engagement with one end of a bobbin, a bobbin ejector element shiftable relative to the chuck, and means operative during the advance of the chuck into gripping engagement with the bobbin to advance the ejector element into holding relation to the bobbin and during the retraction of the support to maintain said holding position of the ejector element while the chuck is being disengaged from the bobbin, said means including a thrust device shiftable relative to the support and a stationary member holding the thrust element against movement during the movement of the ejector element into said holding position relative to the bobbin, said member being adapted to release the thrust device for movement relative to the support during the final movement of the chuck into gripping engagement with the bobbin, and cam means operative in the retracting movement of the support to restore the thrust device to its initial position relative thereto.

5. In a bobbin winding machine having a bobbin holding means including a recessed chuck, a support for the chuck, power driven means for the support operative to carry the chuck into and out of gripping engagement with one end of the bobbin, a bobbin ejector element shiftable relative to the chuck, and means operative during the advance of the chuck into gripping engagement with the bobbin to advance the ejector element into holding relation to the bobbin and during the retraction of the support to maintain said holding position of the ejector element while the chuck is being disengaged from the bobbin, said means including a stationary abutment and a thrust device shiftable relative to the support and into engagement with said abutment upon the advance of the chuck into engagement with the bobbin, and cam means operative during the initial portion of the retracting movement of the support to restrain said thrust device against movement with the support until the chuck has been moved out of engagement with the bobbin, said cam means being further operative in the continued retraction of the support to restore the thrust device to its initial position relative to the support.

6. In a bobbin winding machine having a bobbin holding means including a chuck, a support for the chuck, power driven means for the support operative to carry the chuck into and out of gripping engagement with one end of a bobbin, an ejector element operatively associated with the chuck, a thrust device shiftably mounted on the support, and means operative in the advancing movement of the support to hold said thrust device against movement relative thereto so as to be effective to advance the ejector element into holding relation to the bobbin, said means including a member coacting with said thrust device to permit a shifting thereof relative to the support as an incident to the movement of the chuck into gripping association with the bobbin, said member providing an abutment coacting with said thrust device in the initial portion of the return movement of the support to restrain the thrust device and thereby the ejector element from movement with the support.

7. In a bobbin winding machine having bobbin holding means including a chuck for gripping one end of a bobbin to be wound, a support for the chuck, a slideway in which the support is mounted for reciprocating movement toward and from the bobbin, a bobbin ejector element slidable in said support axially of the chuck, a stationary member fixed with respect to the slideway and disposed at one side of said support, said member providing a shoulder with a recess forwardly thereof, and a thrust device element shiftably mounted on the support and operatively associated with the ejector element, said thrust device comprising a diagonally disposed thrust element coacting with the abutment member during the major portion of the advancing movement of the support to hold said thrust element against movement relative to the support and being movable relative to the support and said shoulder during the final portion of the advancing movement of the support into gripping engagement with the bobbin, whereby to render the thrust element effective upon the ejector element during the initial portion of the retracting movement of the support to hold the ejector element in engagement with the bobbin while the chuck is being disengaged therefrom, said thrust device and shoulder coacting in the continued retraction of the support to restore the thrust element to its initial position relative to the support.

8. In a bobbin Winding machine having a bobbin holding means including a recessed chuck for engagement with one end of a bobbin being wound, a sup, port for the chuck, power driven means for advancing the support to carry the chuck into gripping engagement with the bobbin and then to withdraw the chuck, an ejector element operatively associated with the chuck and engageable with said end of the bobbin, a member providing a forwardly facing shoulder at one side of the support, a thrust element disposed diagonally of the support with one end associated with the ejector element and the other end engageable with said shoulder as the chuck is moved into engagement with the bobbin, said shoulder acting upon said thrust element in the initial portion of the return movement of the support to retard the return of the ejector element and eifect disengagement of the chuck from the bobbin.

9. A bobbin ejector mechanism for a bobbin winding machine having bobbin holding means including a reciprocatory slide and a recessed chuck carried by the slide, said mechanism comprising an ejector element operatively associated with the chuck and engageable with one end of a bobbin, a thrust pin disposed diagonally of the slide and shiftable longitudinally relative thereto, one end of said pin being disposed axially relative to the ejector element, a stationary abutment at one side of the slide providing a shoulder, said abutment member acting upon the thrust pin during the major portion of the advancing movement of the slide to hold the thrust pin against shifting movement, and said shoulder coacting with the pin as the chuck is moved into engagement with the bobbin to permit movement of the pin relative to the slide, said shoulder further coacting with said pin during the initial portion of the return movement of the slide to retard the return of the ejector element and thereby effect disengagement of the chuck from the bobbin.

10. An ejector mechanism for a bobbin winding machine having a reciprocatory slide with a recessed chuck on the slide for engagement with one end of a bobbin, an ejector element slidable axially relative to the chuck, a stationary abutment at one side of the slide having a forwardly facing shoulder, said slide having adiagonal bore, a thrust pin in said bore having its forward end operatively associated with the ejector element, said member coacting with the rear end of the thrust pin during the major portion of the advancing movement of the slide to hold the thrust pin against shifting in the slide and said shoulder being positioned so that as an incident to the movement of the chuck into engagement with the bobbin the thrust pin is permitted to shift relative to the slide into engagement with shoulder, said shoulder coacting with the rear end of the pin in the retracting movement of the slide to restore the pin to its initial position relative to the slide and during such restoring movement to maintain the ejector element in holding relation to the bobbin while the chuck is being disengaged therefrom.

11. An ejector mechanism for a bobbin winding machine having a reciprocating slide with a chuck thereon for engaging one end of a bobbin, an ejector element mounted in the slide and shiftable axially relative to the chuck, a stationary abutment member at one side of the slide, a thrust device comprising a pin slidable axially relative to the slide and engageable with said ejector element and a thrust element pivotally connected with said pin and held by said abutment member against pivotal movement during the major portion of the advancing movement of the slide, said abutment member having a shoulder positioned to permit pivotal movement of the thrust element as an incident to the engagement of the ejector element with the bobbin, said shoulder being operative upon the thrust device during the initial portion of the retracting movement of the slide to restore the pivotal thrust element to its initial position relative to the slide and during such restoring movement to retard the return movement of the ejector element with the slide while the chuck is being disengaged from the bobbin.

12. An ejector mechanism for a bobbin winding machine having a reciprocating slide with a chuck thereon for engaging one end of a bobbin, an ejector element mounted in the slide and shiftable axially relative to the chuck, a stationary abutment member, a thrust device comprising a pin slidable axially relative to the slide and engageable with said ejector element and a toggle linkage pivotally connecting said pin with the slide and held by said abutment member against flexing movement during the major portion of the advancing movement of the slide, said abutment member having a shoulder positioned to permit flexing of the toggle as an incident to the engagement of the ejector element with the bobbin, said shoulder being operative during the initial portion of the retracting movement of the slide to restore the toggle to its initial position relative to the slide and during such restoring movement to retard the return movement of the ejector element with the slide while the chuck is being disengaged from the bobbin.

13. In a bobbin winding machine having a bobbin holding means including a chuck, the combination of a movable support for carrying the chuck into and out of gripping engagement with one end of a bobbin, said chuckbeing held against endwise movement relative to the support, and means conditioned in the advance of said support for holding the bobbin against movement with the chuck upon retraction thereof with the support.

14. A mechanism for rotatably supporting a bobbin or other article comprising, in combination, a pair of chucks mounted for relative approaching and retracting movements, one of said chucks having a reciprocable support and an ejector element movable relative to the chuck, and means conditioned in the movement of said support in one direction for holding the ejector element against movement with the chuck upon movement of the support in the opposite direction.

References Cited in the file of this patent UNITED STATES PATENTS 177,044 Wassmer May 2, 1876 1,317,455 Perrine Sept. 30, 1919 2,445,998 Drake July 27, 1948 2,573,367 Schweiter Oct. 30, 1951 2,576,498 Bassofr' Nov. 27, 1951 

